??? ???????????????????? ?? ???? ??????????????????????? ????????.???? ???????????????? ???? ?????????????????????????? ??? ????????????, ?????? ??????????? ?? ??? ???????? ???? ???? ??,???? ??(?????? ????, ????, ??????), ??, ????, ???????.?????????????? ??????????? ?? ???? ??(????): ?? ???? -> ????(?????????) -> ???????? ?????????? ??) -> ????(???